The CSA rating system for multihulls was conceived to adapt the well established Texel Rating system to the local requirements of multihull racing in the Caribbean.  The formulas and calculations used in our rating system are based on those used successfully for the Texel Rating and its derivatives such as Multihull Dynamics, Multi 2000, Swedish Rating System and OMR among others.  We have not attempted to reinvent anything but have merely adjusted the rule to:
  • Bring the method of sail area calculation in line with what is already in use by the CSA and IMS
  • Accommodate yachts with different sizes and types of daggerboards
  • Accommodate yachts that use foils to reduce their wetted surface area
  • Introduce dual wind band ratings to fairly rate yachts in different conditions
  • Simplify the formula to directly produce Time Correction Factors that will assist regatta organisers to process results
Development of the rule was carried out by CSA measurer Stuart Knaggs, assisted by fellow measurer Alfred Koolen, Paul Miller of Regatta Guru and Nico Boon of the Texel Ratings.  The rule has been used successfully since 2014 after being extensively tested against results of previous regattas.  It has been found to return  tighter corrected times that reflect yacht potential better than comparable systems.  Development of the rule will continue to adapt over time to address new innovations in yacht design.